Choosing the Optimal Assembly Angle of Multi-Part Elastic Rotor Components with the Aim of Passing Critical Speeds

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Ghamari, Mohammad Amin | 2023

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 56799 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Dehghani Firouzabadi, Ruhollah; Amirzadegan, Sadegh
Abstract:
Multi-part rotating parts are used in various industries with very high revolutions. Therefore, the method of assembling each part and keeping the axis of rotation of each part close to the axis passing through two supports (bearings) is important. In this research, three main steps are followed, the development of the differential equations governing the multi-part rotating system and the calculation of the range of oscillations created at the critical points, and then the calculation of the optimal assembly angles with the aim of reducing the introduced oscillations, and finally the discussion of crossing the speeds A crisis is being investigated. The method of obtaining the system of equations depending on the term of time and space is done with the energy method (Lagrange), and the finite element method has been used to separate the variables in order to numerically solve (Newmark) the system of time equations in order to get the answer
Keywords:
Critical Velocity ; Optimization ; Mass Unbalanced Force ; Rotor Dynamics ; Geometry Unbalance ; Multi-Part Rotor Assembly ; Finite Element Method

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